Automation System
A disadvantage of Numerical Control (NC) is:

the tape and tape reader are not reliable
the computer is not reliable
one operator is needed for each machine.
the machine tool can easily overheat
None of these

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Automation System
Ergonomics refers to:

the cost relationship of the workstation versus productivity
None of these
the technology involved in the workstation itself
the human aspect of the environment around the workstation as well as the workstation itself
the level of involvement the operator has with the workstation

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